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Financial Risk Management - Disclosure of Customer Finance Fair Value Reconciliation (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Customer Finance Reconciliation [Abstract] |  |
Opening balance | kr 6,917 | kr 5,370
Additions | 20,758 | 49,583
Disposals/repayments | (23,920) | (47,409)
Revaluation/amortization of interest | 407 | (467)
Translation difference | 360 | (160)
Closing balance | 4,522 | 6,917
Of which non-current | kr 190 | kr 1,347

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- Definition Disclosure of customer finance reconciliation. + References No definition available. + Details
Name: | eric_DisclosureOfCustomerFinanceReconciliationAbstract
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Fair value reconciliation of customer finance. + References No definition available. + Details
Name: | eric_FairValueReconciliationOfCustomerFinance
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value reconciliation of customer finance additions. + References No definition available. + Details
Name: | eric_FairValueReconciliationOfCustomerFinanceAdditions
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair value reconciliation of customer finance disposals and repayments. + References No definition available. + Details
Name: | eric_FairValueReconciliationOfCustomerFinanceDisposalsAndRepayments
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair value reconciliation of customer finance non current. + References No definition available. + Details
Name: | eric_FairValueReconciliationOfCustomerFinanceNonCurrent
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value reconciliation of customer finance revaluation. + References No definition available. + Details
Name: | eric_FairValueReconciliationOfCustomerFinanceRevaluation
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value reconciliation of customer finance translation difference. + References No definition available. + Details
Name: | eric_FairValueReconciliationOfCustomerFinanceTranslationDifference
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration